Jesse Brooks, 36, is serving 15 to 30 years in prison for helping his father recruit friends to kill Jack Reid, whom he accused of theft. Jesse Brooks' alleged involvement included attending a planning meeting in Las Vegas shortly before the murder, but Lorraine Brooks says her son was in court and at a doctor's appointment that day.

"Every mother must think their child is innocent when accused of a crime. I know this crime is beyond my son's nature," she said at a news conference. "But more importantly, the evidence that has come to light proves beyond a reasonable doubt that my son is innocent."

A team of hired investigators displayed copies of receipts backing up those claims and said Brooks' former defense lawyers erred in ignoring what they called a "rock-solid" alibi at his trial. They also suggested police and prosecutors failed to do basic investigating that would have revealed the truth and instead relied on testimony from other players in the crime, who had reason to falsely implicate Brooks.

"They may as well have hired Lance Armstrong as their speaker, because it was lie after lie on top of lie," said investigator Paul Ciolino. "This case is not about conspiracy to commit murder. Jesse Brooks is in jail because his name is Brooks, that's it."

John "Jay" Brooks, Jesse Brooks' father, believed Reid had stolen a trailer full of motorcycles from the family and was convicted of plotting Reid's murder over nearly two years and paying the killers. Reid was bludgeoned to death with a sledgehammer at a Deerfield horse farm.

His 2008 trial marked the state's first capital murder trial in nearly 50 years. He is serving a life sentence after a jury opted not to impose a death sentence.

The team and Lorraine Brooks also criticized former Attorney General Kelly Ayotte, now a U.S. senator, and Assistant Attorney General Janice Rundles, accusing them of prosecuting Jesse Brooks to further their careers.

"That's absurd," Ayotte responded Monday. "The charges against him were brought based on the evidence of the crimes he committed."

Rundles said last week she would not comment on the news conference.

The criticisms of Ayotte and Rundles aren't part of a court motion Brooks filed last week seeking a new trial. He already has lost one appeal.

The court motion argues that Brooks' former defense attorneys failed to instruct him that he had a right to testify and did not adequately represent him. The defense team, which called no witnesses during the trial, did not return a call seeking comment Monday.

In addition to the alibi receipts, Lorraine Brooks and the investigative team also released audio and video they argued further clear Jesse Brooks. The video largely consisted of friends of Brooks claiming they never said what police reported they said during interviews.

In an audio recording, one of the men directly involved in the killing talks to his mother, who says, "If you go down for this I hope you take Jesse with you ... Because if you were involved in this, I know it was Jesse that took you there." Michael Benton answers, "No, it wasn't," which the investigative team argues shows that Brooks had no involvement in the plot.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.